The most famous of the Sloths, we all know more or less, is the Megatherium. A ground sloth sturdy-looking, with more than 3000 kg (6.600 lb) . But there is another Sloths, thalassocnus, which has the peculiarity of being prehistoric and water.

The thalassocnus moved slowly and peaceful, sometimes snorkelling hunting dangerous algae and mosses with bladed teeth.

Like the Megatherium, the thalassocnus also had big, strong arms, but not to grab the branches of trees, but to cling to the seafloor, holding well to the underwater rocks while feeding.

This Sloths was not as big or heavy as its cousin the prehistoric ground sloth, in fact, could be bigger for being aquatic as it can better withstand the weight ... but no. The thalassocnus could measure about 2 meters long (40 ft.), and weighs 120 kg (264 lb.). Sometimes he could leave the water and feed on land plants, but not a large as its cousin, it could easily fall prey to predators such as Sparassodonta or Amphicyon.

Anyway, you do not think that it is rare to see a sloth in the water. Sometimes, amazon overflows, and the only way to move from tree to tree is swimming. Here you can see a sloths, swimming ... it does very well.

It existed between the Miocene and Pliocene (between 25,000 and 2.5 million years ago) in what is now known as South America.

The epanterias Amplexus was probably the greatest of all Allosaurus. I say probably because many experts do not consider the rest found, the rest of a different species to allosauros. But this confusion is normal, the only bones that have been found are, 3 vertebrae a coracoid (a part of the body near the shoulder) and a metatarsal (a finger). Of these fossils, after analyzing the experts, it has concluded that they were Allosaurus, which were quite large, even more than the Saurophaganax or Allosaurus fragilis.

The epanterias Amplexus was a theropod (like almost all theropods, bipedal carnivores) allosaurid North America who lived around 150 million years ago ... in the Jurassic.

As to its dimensionsthe measures vary between 12 (39 ft) and 16 meters (52 ft.). Respectively, the first estimate corresponds to those who think that it was only a large Allosaurus fragilis. The measurements between 14 and 16 meters are estimates of those who believe that are treated rather of a different species.

Take for example the case of T. Rex. The Rex measures 12.5 (42 ft.)meters in length. Instead the epanterias Amplexus can reach 14 (45 ft.) meters according to some estimates, however, the most conservative support could reach 12 meters (39 ft.).

The height of one and the other is about 4 meters (13 ft.)high to the hips. If set upright likely it reaches 6 meters. And if we calculate the weight, this would approach between 4 and 5 tonnes (2250 lb.).

Only seeing the data we get an idea of their proportions. In fact, it is considered the longest of all allosáuridos, and larger and heavier than the Allosaurus fragilis ... if he really is a different species allosaurido.

If we saw to it quickly, clearly we would see the differences between epanterias Amplexus the T.Rex. For example, the first has smaller than the second head. Another characteristic feature is that the T.Rex has little arms, however the epanterias Amplexus has a longer and arms with huge claws.

If we had X-ray eyes, we would see that the T. Rex skull is more compact, its bite was stronger. Instead, the epanterias Amplexus had a lighter skull, but the top of his skull was secure with a powerful neck and would aim a bite with the upper teeth as an ax.

Among its favorite foods we would find Camptosaurus, Diplodocus and Stegosaurus ... of the greatest of all herbivores.